Question

The ionic radii of $$O^{2-},F^{-},Ne,N{a}^{+}andM{g}^{2+}$$ are 1.35, 1.34, 03.95 and 0.66 Å respectively. The radius of the Ne atom is:
1.54 Å
1.12 Å
0.85 Å
0.50 Å

Answer 1

Hint:Ionic radii is defined as the distance which is present between the nucleus of an ion and the outermost shell of the ion. The atomic size of the cation is always smaller than that of the parent atom. The atomic size of the anion is always bigger than that of the parent atom.

Complete step by step answer:
Ionic radius is the radius of a monatomic ion in an ionic crystal shape. Although neither atoms or ions have sharp obstacles, they may be from time to time handled as though they have been hard spheres with radii such that the sum of ionic radii of the cation and anion gives the space between the ions in a crystal lattice. Ionic radii are commonly given in devices of both picometers (pm) or angstroms (Å), with 1 Å = a hundred pm. Ions can be larger or smaller than the neutral atom, relying on the ion's electric powered charge. When an atom loses an electron to shape a cation, the opposite electrons are more drawn to the nucleus, and the radius of the ion receives smaller. Similarly, when an electron is added to an atom, forming an anion, the delivered electron will increase the scale of the electron cloud by interelectronic repulsion. The species which has the most negative charge will have maximum ionic radii and the species which have maximum positive rate can have minimum ionic radii. Thus, the order of ionic radii may be:
$$O^{2-}>F^{-}>Ne>N{a}^{+}>M{g}^{2+}$$
 Here Ne has greater ionic radii than sodium and magnesium ion as Ne has a van der Waals radius which is bigger than the ionic radii of those cations. Thus, radii of Ne have to be among F− and Na+ i.e. Radii of Ne have to be extra than 0.95A˚ and less than 1.34A˚. Thus, ionic radii of Ne ought to be 1.12A˚.
Hence option 2 is correct.

Additional Information:
The distance among two ions in an ionic crystal can be determined by way of X-ray crystallography, which offers the lengths of the sides of the unit mobile of a crystal. For example, the period of each fringe of the unit cell of sodium chloride is found to be 564.02 pm. Each edge of the unit mobile of sodium chloride can be taken into consideration to have the atoms organized.

Note:
The ionic radius isn't always a fixed asset of a given ion, but varies with coordination range, spin kingdom and other parameters. Nevertheless, ionic radius values are sufficiently transferable to allow periodic developments to be identified. As with other styles of atomic radius, ionic radii grow on descending a group. Ionic size (for the identical ion) additionally will increase with growing coordination wide variety, and an ion in an excessive-spin kingdom will be larger than the equal ion in a low-spin state. In well known, ionic radius decreases with growing positive rate and will increase with growing negative charge.